#include<stdio.h>
#include<stdlib.h>

int main(int argc,char **argv)
{
    FILE *fp;
    if (argc < 2)
    {
        fprintf(stderr,"Usage:%s filename\n",argv[0]);
        exit(1);
    }
    fp = fopen(argv[1],"r");
    if(fp == NULL){
        perror("fopen()");
        exit(1);
    }

    fseek(fp,0,SEEK_END);
    printf("%ld\n",ftell(fp));

    exit(0);
}